:root{--bg:#f3f5f7;--panel:#ffffff;--ink:#171a1f;--muted:#68717d;--line:#d9dee5;--soft:#f8f9fb}*{box-sizing:border-box}body{min-width:320px;margin:0;background:var(--bg);color:var(--ink);font-family:Arial,Helvetica,sans-serif}button,input,select,textarea{letter-spacing:0}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px}.simple-shell{display:grid;min-height:100vh;grid-template-rows:auto auto minmax(0,1fr)}.app-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 20px;border-bottom:1px solid var(--line);background:var(--panel)}.app-header h1{margin:0;font-size:24px;font-weight:800}.app-header p{margin:4px 0 0;color:var(--muted)}.header-actions{display:flex;align-items:center;gap:12px}.progress-wrap{display:grid;width:180px;grid-gap:6px;gap:6px}.progress-wrap span{color:var(--muted);font-size:13px;font-weight:700;text-align:right}.filters-bar{display:grid;grid-template-columns:minmax(220px,1fr) 180px 160px 44px;grid-gap:8px;gap:8px;padding:12px 20px;border-bottom:1px solid var(--line);background:var(--panel)}.error-banner{margin:12px 20px 0;padding:10px 12px;border:1px solid #f1b6bd;border-radius:8px;background:#fff0f1;color:#9f1d2f}.study-layout{display:grid;min-height:0;grid-template-columns:minmax(280px,430px) minmax(0,1fr);grid-gap:12px;gap:12px;padding:12px 20px 20px}.question-detail,.question-list{min-height:0;overflow:auto}.question-list{display:grid;align-content:start;grid-gap:6px;gap:6px}.list-topline{display:flex;align-items:baseline;gap:6px;min-height:36px;padding:0 4px;color:var(--muted)}.list-topline strong{color:var(--ink);font-size:22px}.question-item{display:grid;grid-template-columns:34px minmax(0,1fr) 112px;align-items:center;min-height:44px;grid-gap:8px;gap:8px;padding:7px 8px;border:1px solid var(--line);border-radius:6px;background:var(--panel);color:var(--ink);text-align:left}.question-item.active,.question-item:hover{border-color:#8fb4ff;background:#f7faff}.question-number{color:var(--muted);font-weight:800;text-align:right}.question-title{overflow:hidden;font-weight:700;text-overflow:ellipsis;white-space:nowrap}.status-pill{display:inline-flex;min-height:26px;align-items:center;justify-content:center;border-radius:6px;padding:4px 6px;font-size:12px;font-weight:800;line-height:1.1;text-align:center}.status-unknown{border:1px solid #ced4da;background:#ffffff;color:#5c636a}.status-half{border:1px solid #f0c36a;background:#fff4cf;color:#654500}.status-known{border:1px solid #6eb58a;background:#e7f5ec;color:#1f6b3d}.question-panel{display:grid;align-content:start;grid-gap:16px;gap:16px;min-height:100%;padding:22px;border:1px solid var(--line);border-radius:8px;background:var(--panel)}.panel-actions,.panel-topline{display:flex;flex-wrap:wrap;align-items:center;gap:8px}.panel-topline{justify-content:space-between}.question-panel h2{margin:0;font-size:30px;font-weight:800;line-height:1.2}.status-group{width:-moz-fit-content;width:fit-content}.status-choice{min-width:112px}.answer-card{min-height:190px;padding:18px;border:1px solid var(--line);border-radius:8px;background:var(--soft);color:var(--muted);font-size:19px;line-height:1.55}.answer-card.visible{color:var(--ink);white-space:pre-wrap}.panel-actions{border-top:1px solid var(--line);padding-top:14px}.empty-state,.loading-state{display:grid;min-height:220px;place-items:center;border:1px dashed #c3cad3;border-radius:8px;background:var(--panel);color:var(--muted)}@media (max-width:900px){.app-header,.header-actions{align-items:stretch;flex-direction:column}.progress-wrap{width:100%}.filters-bar,.study-layout{grid-template-columns:1fr}.question-list{max-height:340px}}@media (max-width:560px){.app-header,.filters-bar,.study-layout{padding-right:10px;padding-left:10px}.question-item{grid-template-columns:28px minmax(0,1fr)}.question-item .status-pill{grid-column:2;justify-self:start}.question-panel{padding:16px}.question-panel h2{font-size:24px}.status-group{display:grid;width:100%}.status-choice{width:100%}}